Robust online estimation of oscillation frequency belongs to classical problems system identification and adaptive control. The given harmonic signal can be noisy with varying amplitude at the same time, as in case damped vibrations. A novel robust frequency-estimation algorithm is proposed here, motivated by existing globally convergent estimator. advantage estimator requiring one design param...

Hong-Ou-Mandel interferometry takes advantage of the quantum nature two-photon interference to increase resolution precision measurements time-delays. Relying on few-photon probe states, this approach is applicable also in cases extremely sensible samples and it achieves attosecond (nanometer path length) scale resolution, which relevant cell biology two-dimensional materials. Here, we theoreti...